Re: [foxboro] AB Int 30B
- From: WMagda@xxxxxxx
- To: foxboro@xxxxxxxxxxxxx
- Date: Mon, 21 Oct 2002 06:55:30 -0600
I resemble that Micro I/A "peanut gallery" remark.
I have six MIcro I/As that work pretty well. All using AB Flex I/O. I am
not using them to interface with any PLC.
According to what I heard at the Orlando conference, Micro I/A has no
future under the new and improved "ArchestrA". So I would stay away from
it.
Wally Magda
I&C Specialist
Colorado Springs Utilities
660 W. Monument Creek Rd
PO Box 214
USAF Academy, CO 80840
"Johnson, Alex (Foxboro)" <ajohnson@xxxxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
10/17/2002 06:24 PM
Please respond to foxboro
To: foxboro@xxxxxxxxxxxxx
cc:
bcc:
Subject: Re: [foxboro] AB Int 30B
Rule of thumb:
A DI-30 can handle 256 bytes per second from a single ABSCAN/MDSCAN to a
single PLC.
You are reading 76 bytes and writing 40 words per PLC. That would be 116
bytes per PLC or 232 bytes per second.
When you add message overhead and turn around time. I'd say you were at
the
ragged edge of what the device can do.
To minimize loading:
* Query contiguous registers.
* Run one ABSCAN block per second
* Run one ABSCAN in a single compound
The workarounds are:
1) Another DI-30
2) Micro I/A (that should get some response from the peanut gallery)
3) AW-Integrator
Hope this helps.
Regards,
Alex Johnson
Invensys
10707 Haddington
Houston, TX 77063
713.722.2859 (office)
713.722.2700 (switchboard)
713.932.0222 (fax)
ajohnson@xxxxxxxxxxx <mailto:ajohnson@xxxxxxxxxxx>
For the latest information on ArchestrA, go to
www.invensys.com/Archestra.html
<http://www.invensys.com/divisions/Archestra.html> .
-----Original Message-----
From: Dale Gillis
[SMTP:doctorg@xxxxxxxxxxxxxxx]
Sent: Thursday, October 17, 2002 11:27 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] AB Int 30B
Anybody know or have an idea of how many PLC's (AB PLC
5/40) you can
look at with just one Integrator 30B through an AB KF2 card. I currently
have just 2 PLC's on the one Integrator and One KF2 card and only scanning
38 words for input and 20 words for output per PLC and the station loading
screen goes up to 90% loaded in the i/o. Can you hook up more than one
KF2
to the same Integrator 30B processor (that is are the other serial ports
available on the elevator) or should I be looking at some other way to
accomplish this? I would like to have at least 7 PLC's hooked up
eventually.
Regards,
Dale Gillis
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